Hardfacing of Iron and Steel Utilizing Cast Iron Scraps
利用铸铁废料对钢铁进行表面硬化处理
基本信息
- 批准号:08650874
- 负责人:
- 金额:$ 1.47万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:1996
- 资助国家:日本
- 起止时间:1996 至 1997
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
M_7 C_3 appearing in the Fe-C-Cr ternary system can be formed as a pure carbide and is expected to have a low melting temperature, a high hardness and excellent bonding strength with iron substrate. In the present work, microstructure and properties of bulk chromium carbide specimen obtained by melting raw materials have been investigated and it is found that the microstructure of carbide specimen with low chromium content consists of M_7 C_3 and ledeburite, while those of 50%Cr and 60%Cr specimens are obtained as a pure M_7 C_3 carbide. On the basis of these findings, an application of M_7 C_3 chromium carbide as a hardfacing of iron and steel was examined utilizing cast iron scraps as starting materials. Hardness of laser-clad carbide layr was increased with chromium content and it was revealed that the hardfacing layr containing 60%Cr subjected to laser surface melting consists of almost pure M_7 C_3 carbide and shows excellent wear property. Since these carbide was found to posess a coefficient of thermal expansion near those of iron and steel, the hardfacing layr showed a tight bonding with iron sustrate. In the case of utilizing cast iron scraps as a raw material, the same microstructure having a high hardness and an excellent wear resistance was obtained through one-pass laser melting and no significant deference was observed when using gray iron scraps and S.G.iron scraps. Some cracking was seen on the section of laser-hardfacing materials, running perpendicular to the interface between carbide and substrate. It was indicated that the coupled-diffusion processing for the modification of the microstructure of subsurfacc of the iron substrate to functionally graded microstructure can be effective to supress the residual stress concentration near the interface and hence cracking in the carbide layr.
出现在Fe-C-Cr三元体系中的m_7c_3可以形成纯碳化物,具有较低的熔点、较高的硬度和与铁基体的良好结合强度。本文研究了熔融法制备的块状碳化铬试样的显微组织和性能,发现低铬试样的显微组织由m_7c_3和莱氏体组成,而50%Cr和60%Cr试样的显微组织为纯m_7c_3碳化物。在此基础上,以铸铁屑为原料,研究了m_7c_3碳化铬作为钢铁堆焊材料的应用。激光熔覆层的硬度随铬含量的增加而增加,结果表明,激光熔覆层的m7c_3碳化物几乎是纯的,具有良好的耐磨性能。由于发现这些碳化物具有接近铁和钢的热膨胀系数,堆焊层与铁表面结合紧密。在以铸铁屑为原料的情况下,通过一次激光熔化获得了相同的组织,具有高硬度和优异的耐磨性,而使用灰铁屑和sg铁屑时没有明显的差异。激光堆焊材料在垂直于碳化物与基体界面的部分出现裂纹。结果表明,采用耦合扩散工艺将铁基体亚表面组织转化为功能梯度组织,可以有效地抑制界面附近残余应力的集中,从而抑制碳化物层的开裂。
项目成果
期刊论文数量(3)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
A.Kagawa and Y.Ohta: "Utilization of Cast Iron Scraps as a Raw Material for Laser-Clad Chromium Carbide Hardfacing" Journal of Materials Science Letters. 17・2. 99-101 (1998)
A.Kakawa 和 Y.Ohta:“利用铸铁废料作为激光熔覆碳化铬硬面的原材料”《材料科学快报》17・2(1998 年)。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
A.Kagawa and Y.Ohta: "Utilization of Cast Iron Scraps as a RawMaterial for Lase-Clad Chromium Carbide Hardfacing" J.Mater.Sci.Let.vol.17, No.2. 99-101 (1998)
A.Kakawa 和 Y.Ohta:“利用铸铁废料作为激光熔覆碳化铬硬面的原材料”J.Mater.Sci.Let.vol.17,第 2 期。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
A. Kagawa and Y. Ohta: "Utilization of Cast Iron Scraps as a Raw Material for Laser-Clad Chromium carbide Hardfacing" Journal of Materials Science Letters. 17・2. 99-101 (1998)
A. Kakawa 和 Y. Ohta:“利用铸铁废料作为激光熔覆碳化铬硬面的原材料”《材料科学快报》17・2(1998 年)。
- DOI:
- 发表时间:
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- 影响因子:0
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KAGAWA Akio其他文献
KAGAWA Akio的其他文献
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Direct Forming of 3-D Sandwich Parts by Fused Deposition Method Using Double Nozzle
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05650735 - 财政年份:1993
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